Re: [gnugo-devel] intrusions

[Arend Bayer]

On Thu, 9 Dec 2004 address@hidden wrote:

> > endgame:840
> >   A B C D E F G H J K L M N O P Q R S T
> > 19 . . . . O . . . . . . . . . . . . . . 19
> > 18 . . O O X X . . X X O . . . . . . . . 18
> > 17 . . O X . . . X O O . O . X O . . . . 17
> > 16 O . O X . . . X O + O . . X . O . . . 16
> > 15 . O X . . . . X X X a , O . . . . . . 15
> > 14 X O X . . . . . X O , . . . . O . . . 14
> > 13 . X . . . . . . X O . . . . . . . . . 13
> > 12 . . . . . . . X O O . . O . O . . O O 12
> > 
> > GNU Go as white doesn't bother to play at "a", basically because there are
> > two influence blocks next to a, as if white could stop both continuations
> > of black intrusions at the same time. The solutions works as discussed some
> > time ago on the list:
> 
> How about thrash:10. Is this a similar problem?
> 
> (The test currently fails, and resembles the above position
> except that in thrash:10 the K15 dragon is thrashing.)

The way my patch understands the above problem, it is not similar at
all. My patch just changes the territory evaluation around 'a' a bit, in
case X is assumed to move next. thrash:10 is an example of owl missing a
trivial way to escape. Unfortunately, my owl-escape patch is only making
slow progres...

Arend